DP Chemistry (last assessment 2024)
Question 19N.3.sl.TZ0.14c
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.sl.TZ0.14c |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
19N.3.sl.TZ0.14c
Ethanol is a biofuel that can be mixed with gasoline.
(c)
Explain, including a suitable equation, why biofuels are considered to be carbon neutral.
[2]
Markscheme
biofuel raw material/sugar/glucose formed by photosynthesis
OR
biofuel raw material/sugar/glucose uses up carbon dioxide during its formation
OR
biofuel from capturing gases due to decaying organic matter formed from photosynthesis ✔
6CO2 (g) + 6H2O (l) → C6H12O6 (aq) + 6O2 (g) ✔
NOTE: Accept arguments based on material coming from plant sources consuming carbon dioxide/carbon for M1.
